Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/102168
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Type: Journal article
Title: Jet energy measurement and its systematic uncertainty in proton–proton collisions at √s = 7 TeV with the ATLAS detector
Other Titles: Jet energy measurement and its systematic uncertainty in proton-proton collisions at root s = 7 TeV with the ATLAS detector
Author: Aad, G.
ATLAS Collaboration
Citation: The European Physical Journal C, 2015; 75(1):17-1-17-101
Publisher: Springer
Issue Date: 2015
ISSN: 1434-6052
1434-6052
Statement of
Responsibility: 
G. Aad ... P. Jackson ... L. Lee ... A. Petridis ... N. Soni ... M.J. White ... et al. (ATLAS Collaboration)
Abstract: The jet energy scale (JES) and its systematic uncertainty are determined for jetsmeasured with theATLAS detector using proton–proton collision data with a centre-ofmass energy of √s = 7 TeV corresponding to an integrated luminosity of 4.7 fb⁻¹. Jets are reconstructed from energy deposits forming topological clusters of calorimeter cells using the anti-kt algorithmwith distance parameters R = 0.4 or R = 0.6, and are calibrated using MC simulations. A residual JES correction is applied to account for differences between data and MC simulations. This correction and its systematic uncertainty are estimated using a combination of in situ techniques exploiting the transverse momentum balance between a jet and a reference object such as a photon or a Z boson, for 20 ≤ pjet T < 1000 GeV and pseudorapidities |η| < 4.5. The effect of multiple proton–proton interactions is corrected for, and an uncertainty is evaluated using in situ techniques. The smallest JES uncertainty of less than 1 % is found in the central calorimeter region (|η| < 1.2) for jets with 55 ≤ pjet T < 500 GeV. For central jets at lower pT, the uncertainty is about 3 %. A consistent JES estimate is found usingmeasurements of the calorimeter response of single hadrons in proton–proton collisions and test-beam data, which also provide the estimate for pjet T > 1 TeV. The calibration of forward jets is derived from dijet pT balance measurements. The resulting uncertainty reaches its largest value of 6 % for low-pT jets at |η| = 4.5. Additional JES uncertainties due to specific event topologies, such as close-by jets or selections of event samples with an enhanced content of jets originating from light quarks or gluons, are also discussed. The magnitude of these uncertainties depends on the event sample used in a given physics analysis, but typically amounts to 0.5–3 %.
Keywords: Atlas Collaboration; Atlas Collaboration; Atlas Collaboration
Rights: © CERN for the benefit of the ATLAS collaboration 2014. This article is published with open access at Springerlink.com. This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited. Funded by SCOAP3 / License Version CC BY 4.0.
RMID: 0030020200
DOI: 10.1140/epjc/s10052-014-3190-y
Appears in Collections:Physics publications

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